regex - Read a text file line by line and store variables on matching specific pattern in Python

Regex - Read a text file line by line and store variables on matching specific pattern in Python

You can use regular expressions in Python to read a text file line by line and store variables based on matching specific patterns. Here's how you can do it:

import re # Define the regular expression pattern pattern = r'^VariableName:\s*(\w+):\s*(\d+)$' # Initialize variables to store matched values variables = {} # Open the text file for reading with open('your_file.txt', 'r') as file: # Read the file line by line for line in file: # Match the pattern against the current line match = re.match(pattern, line) if match: # Extract the variable name and value from the match variable_name = match.group(1) variable_value = int(match.group(2)) # Store the variable in the variables dictionary variables[variable_name] = variable_value # Print the stored variables print(variables)

In this example:

  • We define a regular expression pattern '^VariableName:\s*(\w+):\s*(\d+)$' to match lines that start with 'VariableName:', followed by a variable name (one or more word characters), a colon, and then a variable value (one or more digits).
  • We initialize an empty dictionary variables to store the matched variable names and values.
  • We open the text file for reading using a with statement to ensure it's properly closed after reading.
  • We iterate over each line in the file using a for loop.
  • For each line, we use re.match() to match the pattern against the line.
  • If a match is found, we extract the variable name and value using the group() method of the match object.
  • We convert the variable value to an integer using int() and store it in the variables dictionary with the variable name as the key.
  • Finally, we print the stored variables. Adjust the pattern and file name according to your specific requirements.

Examples

  1. Python read text file line by line regex example

    • Description: This query is for those looking to read a text file line by line in Python using regular expressions to extract specific patterns.
    • Code Implementation:
      import re pattern = r'your_regex_pattern_here' with open('your_text_file.txt', 'r') as file: for line in file: match = re.search(pattern, line) if match: # Store variables based on the matching pattern variable1 = match.group(1) variable2 = match.group(2) # Process or store the variables as needed

  2. Python regex extract variables from text file

    • Description: This query targets those who want to extract variables from a text file using Python's regex capabilities.
    • Code Implementation:
      import re pattern = r'your_regex_pattern_here' with open('your_text_file.txt', 'r') as file: data = file.read() matches = re.findall(pattern, data) for match in matches: # Store variables from each match variable1 = match[0] variable2 = match[1] # Process or store the variables as needed

  3. Python read file line by line regex match

    • Description: This query is for those specifically interested in matching patterns line by line while reading a file in Python using regular expressions.
    • Code Implementation:
      import re pattern = r'your_regex_pattern_here' with open('your_text_file.txt', 'r') as file: for line in file: if re.search(pattern, line): # Process or store the line as needed

  4. Python regex match pattern in text file

    • Description: This query caters to individuals seeking to match specific patterns within a text file using Python's regex functionalities.
    • Code Implementation:
      import re pattern = r'your_regex_pattern_here' with open('your_text_file.txt', 'r') as file: data = file.read() match = re.search(pattern, data) if match: # Store or process the matched pattern matched_text = match.group()

  5. Python regex pattern matching example

    • Description: This query suits those who want a general example of pattern matching using regular expressions in Python.
    • Code Implementation:
      import re pattern = r'your_regex_pattern_here' text = 'your_text_here' match = re.search(pattern, text) if match: # Store or process the matched pattern matched_text = match.group()

  6. Python regex extract data from file

    • Description: This query targets users who aim to extract specific data from a file using regular expressions in Python.
    • Code Implementation:
      import re pattern = r'your_regex_pattern_here' with open('your_text_file.txt', 'r') as file: data = file.read() matches = re.findall(pattern, data) for match in matches: # Process or store each match as needed

  7. Python regex find and store variables

    • Description: This query is for those interested in finding and storing variables from text using Python's regex capabilities.
    • Code Implementation:
      import re pattern = r'your_regex_pattern_here' text = 'your_text_here' match = re.search(pattern, text) if match: # Store variables from the matched pattern variable1 = match.group(1) variable2 = match.group(2) # Process or store the variables as needed

  8. Python regex read and parse text file

    • Description: This query caters to individuals aiming to read and parse a text file using regular expressions in Python.
    • Code Implementation:
      import re pattern = r'your_regex_pattern_here' with open('your_text_file.txt', 'r') as file: for line in file: matches = re.findall(pattern, line) for match in matches: # Process or store each match as needed

  9. Python regex extract specific data from file

    • Description: This query is for those who want to extract specific data from a file using regular expressions in Python.
    • Code Implementation:
      import re pattern = r'your_regex_pattern_here' with open('your_text_file.txt', 'r') as file: data = file.read() match = re.search(pattern, data) if match: # Store or process the matched pattern matched_text = match.group()

  10. Python regex pattern matching in file

    • Description: This query addresses individuals looking for ways to perform pattern matching within a file using regular expressions in Python.
    • Code Implementation:
      import re pattern = r'your_regex_pattern_here' with open('your_text_file.txt', 'r') as file: for line in file: if re.search(pattern, line): # Process or store the line as needed

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